unist-util-inspect

unist utility to inspect trees

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • inspect(tree[, options])
  • inspectColor(tree[, options])
  • inspectNoColor(tree[, options])
• Types
  • Inspect
  • Options
• Contribute

What is this?

This is a tiny, but useful, package that pretty prints any unist tree.

When should I use this?

This utility pretty prints the tree in a format custom made for unist trees. This is useful for spotting bugs, as well as getting an idea of whats going on in the tree. Both trees and node lists can be printed.

Install

This package is ESM only.

In Node.js (18+) with yarn:

yarn add @flex-development/unist-util-inspect

See Git - Protocols | Yarn  for info regarding installing from Git.

In Deno with esm.sh:

import { inspect } from 'https://esm.sh/@flex-development/unist-util-inspect'

In browsers with esm.sh:

<script type="module">
  import { inspect } from 'https://esm.sh/@flex-development/unist-util-inspect'
</script>

With bun:

bun add @flex-development/unist-util-inspect

Use

Suppose we have the file dbl-linear.mts, and the following module, example.mts:

import type * as docast from '@flex-development/docast'
import { fromDocs } from '@flex-development/docast-util-from-docs'
import { inspect } from '@flex-development/unist-util-inspect'
import { read } from 'to-vfile'
import type { VFile } from 'vfile'

const file: VFile = await read('dbl-linear.mts')

const tree: docast.Root = fromDocs(file)

console.log(inspect(tree))

...running node --experimental-strip-types --experimental-transform-types ./example.mts yields:

root[7]
├─0 comment[3] (1:1-5:4, 0-106)
│   ├─0 blockTag<@file>[1] (2:4-2:19, 7-22)
│   │   └─0 text "dblLinear" (2:10-2:19, 13-22)
│   ├─1 blockTag<@module>[1] (3:4-3:21, 26-43)
│   │   └─0 text "dblLinear" (3:12-3:21, 34-43)
│   └─2 blockTag<@see>[1] (4:4-4:59, 47-102)
│       └─0 text "https://codewars.com/kata/5672682212c8ecf83e000050" (4:9-4:59, 52-102)
├─1 comment[7] (7:1-27:4, 108-684)
│   ├─0 description[7] (8:4-14:68, 115-416)
│   │   ├─0 paragraph[5] (8:4-8:60, 115-171)
│   │   │   ├─0 text "Consider a sequence " (8:4-8:24, 115-135)
│   │   │   ├─1 inlineCode "u" (8:24-8:27, 135-138)
│   │   │   ├─2 text " where " (8:27-8:34, 138-145)
│   │   │   ├─3 inlineCode "u" (8:34-8:37, 145-148)
│   │   │   └─4 text " is defined as follows:" (8:37-8:60, 148-171)
│   │   ├─1 break (8:60-9:1, 171-172)
│   │   ├─2 break (9:3-10:1, 174-175)
│   │   │     data: {"blank":true}
│   │   ├─3 list[3] (1:1-1:1)
│   │   │   │ ordered: true
│   │   │   │ start: 1
│   │   │   │ spread: false
│   │   │   ├─0 listItem[4] (10:5-10:53, 179-227)
│   │   │   │   │ spread: false
│   │   │   │   │ checked: null
│   │   │   │   ├─0 text "The number " (10:8-10:19, 182-193)
│   │   │   │   ├─1 inlineCode "u(0) = 1" (10:19-10:29, 193-203)
│   │   │   │   ├─2 text " is the first one in " (10:29-10:50, 203-224)
│   │   │   │   └─3 inlineCode "u" (10:50-10:53, 224-227)
│   │   │   ├─1 listItem[11] (11:5-11:77, 232-304)
│   │   │   │   │ spread: false
│   │   │   │   │ checked: null
│   │   │   │   ├─0  text "For each " (11:8-11:17, 235-244)
│   │   │   │   ├─1  inlineCode "x" (11:17-11:20, 244-247)
│   │   │   │   ├─2  text " in " (11:20-11:24, 247-251)
│   │   │   │   ├─3  inlineCode "u" (11:24-11:27, 251-254)
│   │   │   │   ├─4  text ", " (11:27-11:29, 254-256)
│   │   │   │   ├─5  inlineCode "y = 2x + 1" (11:29-11:41, 256-268)
│   │   │   │   ├─6  text " and " (11:41-11:46, 268-273)
│   │   │   │   ├─7  inlineCode "z = 3x + 1" (11:46-11:58, 273-285)
│   │   │   │   ├─8  text " must be in " (11:58-11:70, 285-297)
│   │   │   │   ├─9  inlineCode "u" (11:70-11:73, 297-300)
│   │   │   │   └─10 text " too" (11:73-11:77, 300-304)
│   │   │   └─2 listItem[2] (12:5-12:41, 309-345)
│   │   │       │ spread: false
│   │   │       │ checked: null
│   │   │       ├─0 text "There are no other numbers in " (12:8-12:38, 312-342)
│   │   │       └─1 inlineCode "u" (12:38-12:41, 342-345)
│   │   ├─4 break (12:41-13:1, 345-346)
│   │   ├─5 break (13:3-14:1, 348-349)
│   │   │     data: {"blank":true}
│   │   └─6 paragraph[5] (14:4-14:68, 352-416)
│   │       ├─0 text "Given an index, " (14:4-14:20, 352-368)
│   │       ├─1 inlineCode "n" (14:20-14:23, 368-371)
│   │       ├─2 text ", the function returns the element at " (14:23-14:61, 371-409)
│   │       ├─3 inlineCode "u(n)" (14:61-14:67, 409-415)
│   │       └─4 text "." (14:67-14:68, 415-416)
│   ├─1 blockTag<@example>[1] (16:4-17:28, 423-459)
│   │   └─0 code "await dblLinear(0) // 1" (17:5-17:28, 436-459)
│   │         lang: null
│   │         meta: null
│   ├─2 blockTag<@example>[1] (18:4-19:30, 463-501)
│   │   └─0 code "await dblLinear(10) // 22" (19:5-19:30, 476-501)
│   │         lang: null
│   │         meta: null
│   ├─3 blockTag<@example>[1] (20:4-21:32, 505-545)
│   │   └─0 code "await dblLinear(100) // 447" (21:5-21:32, 518-545)
│   │         lang: null
│   │         meta: null
│   ├─4 blockTag<@example>[1] (22:4-23:36, 549-593)
│   │   └─0 code "await dblLinear(7687) // 111718" (23:5-23:36, 562-593)
│   │         lang: null
│   │         meta: null
│   ├─5 blockTag<@param>[2] (25:4-25:46, 600-642)
│   │   ├─0 typeExpression "number" (25:11-25:19, 607-615)
│   │   └─1 text "n - Sequence element index" (25:20-25:46, 616-642)
│   └─6 blockTag<@return>[3] (26:4-26:38, 646-680)
│       ├─0 typeExpression "number" (26:12-26:20, 654-662)
│       ├─1 text "Element at " (26:21-26:32, 663-674)
│       └─2 inlineCode "u(n)" (26:32-26:38, 674-680)
├─2 comment[2] (29:3-33:6, 727-781)
│   ├─0 description[1] (30:6-30:15, 736-745)
│   │   └─0 paragraph[1] (30:6-30:15, 736-745)
│   │       └─0 text "Sequence." (30:6-30:15, 736-745)
│   └─1 blockTag<@const>[2] (32:6-33:1, 756-776)
│       ├─0 typeExpression "number[]" (32:13-32:23, 763-773)
│       └─1 text "u" (32:24-32:25, 774-775)
├─3 comment[2] (36:3-40:6, 811-900)
│   ├─0 description[1] (37:6-37:54, 820-868)
│   │   └─0 paragraph[3] (37:6-37:54, 820-868)
│   │       ├─0 text "Index of x in " (37:6-37:20, 820-834)
│   │       ├─1 inlineTag<@linkcode> "u" (37:20-37:33, 834-847)
│   │       └─2 text " used to calculate y." (37:33-37:54, 847-868)
│   └─1 blockTag<@var>[2] (39:6-40:1, 879-895)
│       ├─0 typeExpression "number" (39:11-39:19, 884-892)
│       └─1 text "j" (39:20-39:21, 893-894)
├─4 comment[2] (43:3-47:6, 924-1013)
│   ├─0 description[1] (44:6-44:54, 933-981)
│   │   └─0 paragraph[3] (44:6-44:54, 933-981)
│   │       ├─0 text "Index of x in " (44:6-44:20, 933-947)
│   │       ├─1 inlineTag<@linkcode> "u" (44:20-44:33, 947-960)
│   │       └─2 text " used to calculate z." (44:33-44:54, 960-981)
│   └─1 blockTag<@var>[2] (46:6-47:1, 992-1008)
│       ├─0 typeExpression "number" (46:11-46:19, 997-1005)
│       └─1 text "j" (46:20-46:21, 1006-1007)
├─5 comment[2] (52:5-56:8, 1118-1173)
│   ├─0 description[1] (53:8-53:12, 1129-1133)
│   │   └─0 paragraph[2] (53:8-53:12, 1129-1133)
│   │       ├─0 inlineCode "y" (53:8-53:11, 1129-1132)
│   │       └─1 text "." (53:11-53:12, 1132-1133)
│   └─1 blockTag<@const>[2] (55:8-56:1, 1148-1166)
│       ├─0 typeExpression "number" (55:15-55:23, 1155-1163)
│       └─1 text "y" (55:24-55:25, 1164-1165)
└─6 comment[2] (59:5-63:8, 1215-1270)
    ├─0 description[1] (60:8-60:12, 1226-1230)
    │   └─0 paragraph[2] (60:8-60:12, 1226-1230)
    │       ├─0 inlineCode "z" (60:8-60:11, 1226-1229)
    │       └─1 text "." (60:11-60:12, 1229-1230)
    └─1 blockTag<@const>[2] (62:8-63:1, 1245-1263)
        ├─0 typeExpression "number" (62:15-62:23, 1252-1260)
        └─1 text "z" (62:24-62:25, 1261-1262)

API

This package exports the identifiers inspect, inspectColor, and inspectNoColor.

There is no default export.

inspect(tree[, options])

Inspect a tree with color in supported environments or without color in environments that do not support color.

Parameters

• tree (unknown) — the tree to inspect
• options (Options | null | undefined) — configuration options

Returns

(string) Pretty printed tree

inspectColor(tree[, options])

Inspect a tree with color.

Otherwise the same as inspect.

inspectNoColor(tree[, options])

Inspect a tree without color.

Otherwise the same as inspect.

Types

This package is fully typed with TypeScript.

Inspect

Inspect a tree (TypeScript type).

type Inspect = (tree: unknown, options?: Options | null | undefined) => string

Parameters

• tree (unknown) — the tree to inspect
• options (Options | null | undefined) — configuration options

Returns

(string) Pretty printed tree

Options

Configuration options (TypeScript interface).

Properties

• positions? (boolean | null | undefined) — whether to include positional information
  • default: true

Contribute

See CONTRIBUTING.md.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.